Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8732: S/2006 (624) 1; 2006ds, 2006dt

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 8731 SEARCH Read IAUC 8733

View IAUC 8732 in .dvi, .ps or .PDF format.
IAUC number 

                                                  Circular No. 8732
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


S/2006 (624) 1
     F. Marchis and M. H. Wong, University of California at
Berkeley (UCB); J. Berthier, P. Descamps, D. Hestroffer, and F.
Vachier, Institut de Mecanique Celeste et de Calcul des Ephemerides,
Observatoire de Paris; D. Le Mignant, W. M. Keck Observatory; and I.
de Pater, UCB, report the discovery of a satellite of (624) Hektor
using the Keck-II telescope and its Laser Guide Star Adaptive
Optics system.  Observations of this L4 Trojan minor planet (V =
14.4), recorded in H- and K-band filters on July 16.582 UT over a
20-min baseline, clearly show the presence of a moonlet companion
(peak S/N = 20) at 0".36 (p.a. 250 deg) from the primary.  The
shape of the resolved primary can be approximated by an ellipse
with major and minor axes 2a = 350 km and 2b = 210 km (108 and
65 milli-arcseconds), but several individual images further indicate
that the primary may have a bilobated shape.  Based on the
integrated brightness ratio between the moonlet and the primary of
about 6.5, the diameter of S/2006 (624) 1 is estimated to be about
15 km.


SUPERNOVAE 2006ds AND 2006dt
     Two additional supernovae have been discovered on unfiltered
CCD images:  2006ds by Y.-S. Tsai and K.-C. Lu (0.40-m reflector,
Kenting Star Village Observatory, Hengchun, Taiwan; note spelling
correction to Lu's name from the initial report on CBET 580),
and 2006dt by N. Lee and W. Li (via LOSS/KAIT; cf. IAUC 8731).

SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2006ds  July 18.80  22 55 18.32  -33 55 17.5  16.1  5".4 W, 3".6 S
2006dt  July 20.20  14 35 43.11  + 8 17 55.8  16.8  2".9 E, 6".2 S

SN 2006ds in PGC 70011 was confirmed at mag about 15.5 on a CCD
frame taken by Tsai and Lu on July 19.82 UT; nothing is visible at
this location on a Digitized Sky Survey image (limiting red mag
20.5).  SN 2006ds is a type-II supernova (spectroscopic details on
CBET 580).  Additional magnitudes for 2006dt in NGC 5681:  July
11.20, [19.0; 15.23, 17.5.  SN 2006dt is a type-Ia supernova, near
maximum on July 21.22 (details on CBET 582).

                      (C) Copyright 2006 CBAT
2006 July 21                   (8732)            Daniel W. E. Green

Read IAUC 8731 SEARCH Read IAUC 8733

View IAUC 8732 in .dvi, .ps or .PDF format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!